A t Test that is helpful in comparing a set of scores on a variable measured at the interval level, to a single score that serves as a threshold of functioning is:

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The one-sample t Test is the best choice as it compares a set of scores to a single score and makes inferences about whether the set of scores differs significantly from the single score. This is helpful for evaluating if an individual's score on a variable measured at the interval level is significantly different from a certain threshold or norm. The independent samples t Test is used for comparing two different groups, the t Test for paired data is used for comparing two related samples, and ANOVA is used for comparing three or more groups.

A T Test That Is Helpful in Comparing a Set